15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Weak measurements with an ensemble quantum processor.

19 Jun 2014, 10:00
C-309 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Non-Student) / orale (non-étudiant) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) (R1-6) Quantum Information Theory - DTP-DAMOPC-DCMMP / Théorie de l'information quantique - DPT-DPAMPC-DPMCM


Aharon Brodutch (Univesity of Waterloo)


NMR ensemble quantum processors can be used for implementing a universal quantum circuit with a limited number of qubits using current technologies. The computation is carried out with high fidelity over a large number of processors (individual molecules) in parallel and the readout corresponds to ensemble averages of single-qubit observables. This type of readout poses a obstacle when the algorithm requires post-processing on individual outcomes, for example in the case of weak measurements with post-selection. We present a method for overcoming the challenge of post-selection in an ensemble processor and show experimental results of the first weak measurement in NMR. The experiment involves 3 qubits but can be extended to larger systems of up to 12 qubits using conventional methods. These extensions may be useful for carrying out weak measurements experiments that cannot be done with the more common optical setup. * arXiv:1311.5890

Primary author

Aharon Brodutch (Univesity of Waterloo)


Dr Dawei Lu (University of Waterloo) Mr Hang Li (Tsinghua University) Mr Jun li (University of science and technology China) Prof. Raymond Laflamme (University of Waterloo)

Presentation Materials